Perhaps Jacob could start to spread negative rumors about Bella among their mutual friends. This would create a rift not only between them but also within the larger group that they are a part of. He may feel betrayed by Bella for some reason and wants others to see his side.
In a 'Jacob cheats on Bella with Leah' fanfiction, the plot might start with Jacob feeling neglected by Bella who is still somewhat hung up on Edward. Leah, on the other hand, is there for Jacob, and they gradually get closer. This closeness turns into an affair, and when Bella discovers it, there could be a big fight. Bella might be heartbroken and seek revenge, or she could try to win Jacob back. Meanwhile, Jacob has to deal with his guilt and the consequences within the pack as his actions could affect pack dynamics.
One interesting plotline could be their adventures in the forest together. They might discover a hidden part of the forest that has some kind of magical or ancient significance. Another could be them dealing with the reactions of their respective families and friends to their relationship.
Well, in some Jacob and Bella lemon fanfiction, there's a plotline where they are forced to work together on a project for the reservation. This makes them spend a lot of time together and they start to see each other in a new light. Another plot might involve Bella getting injured and Jacob being the one to take care of her. During this time, their relationship deepens in a more tender and affectionate way. There are also stories where they discover a shared interest in a particular art form or hobby and bond over it.
There could also be other characters from the Twilight series involved. For example, the members of Jacob's wolf pack might play a role. They could be trying to mediate between Jacob and Bella, or they might side with Jacob, adding more tension to the story.
One possible scenario is that Jacob reveals a secret that Bella doesn't like. This could make her feel betrayed and start to hate him.
A plotline could be that Ron betrays Harry's trust by sharing a secret with someone he shouldn't. Harry is initially furious but then realizes Ron was manipulated. Harry forgives Ron, and they work together to fix the mess caused by the shared secret. For example, if the secret was about a new spell they were developing, they have to stop the wrong people from using it.
In some fanfictions, Bella might be involved in a community project where she meets Jacob again after a long time. Their shared values in helping the community bring them closer, and they start to see each other in a new light. This could lead to a sweet and slow - burning romance.
One possible plotline could be that Marcus discovers Bella's blindness and is initially hesitant about their relationship but then grows to see it as something that makes her unique and special. He might then become very protective of her.
Well, perhaps she is a metahuman in a world where there are different factions of metahumans. Bella could get caught in the middle of a power struggle between these factions. Maybe she has to decide which side she wants to be on, all while trying to understand and control her newfound powers. She might also meet other metahumans who become her friends or mentors and help her on her journey of self - discovery as a metahuman.
One possible plotline could be that Bella starts smoking as a form of rebellion. Maybe she's feeling suffocated by the expectations around her in her usual story setting, and smoking becomes her way to assert her independence.